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Itinerant magnetic excitations in antiferromagnetic CaFe2As2
(American Physical Society, 2009-05-08)
Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe2As2 reveal steeply dispersive and well-defined spin waves up to an energy of ~100 meV. Magnetic excitations above 100 ...
From cooperative paramagnetism to Neel order in Y2Ru2O7: neutron scattering measurements
(American Physical Society, 2008-01-01)
Spin correlations in the pyrochlore antiferromagnet Y2Ru2O7 with Curie-Weiss temperature ΘCW* - 1100 K and critical temperature TN = 77 K were examined through neutron scattering. For TN < T < ΘCW / 3 the data show spin ...
Inhomogeneous level splitting in Pr2-xBixRu2O7
(American Physical Society, 2005-05-06)
We report that Bi doping drives Pr2-xBixRu2O7 from an antiferromagnetic insulator (x=0) to a metallic paramagnet (x≈1) with a broad low T maximum in C/T. Neutron scattering reveals local low energy spin excitations (ℎω≈1 ...